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Qu'est-ce (qui) est undefined$86811$ - définition

UNDEFINED TERM MOTIVATED INFORMALLY, USUALLY BY AN APPEAL TO INTUITION AND EVERYDAY EXPERIENCE, OR INTRODUCED AXIOMATICALLY AND EVENTUALLY GENERATED ONLY BY A SERIES OF ELEMENTARY OPERATIONS

Undefined term; Undefined primitive; Primitive term; Primitive Notion; Primitive concept

undefined

WIKIMEDIA DISAMBIGUATION PAGE

Undefined number; Undefined numbers; Undefined (disambiguation)

¦ adjective not clear or defined.

Derivatives

undefinable adjective

undefinably adverb

undefined

WIKIMEDIA DISAMBIGUATION PAGE

Undefined number; Undefined numbers; Undefined (disambiguation)

a.

1.

Unbounded, limitless, boundless.

2.

Indistinct, indeterminate, indefinite.

nasal demons

BEHAVIOR OF ERRONEOUS COMPUTER PROGRAMS THAT THE LANGUAGE STANDARD PERMITS TO BE UNPREDICTABLE

Undefined behaviour; Nasal demon; Nasal demons

Recognised shorthand on the Usenet group comp.std.c for any unexpected behaviour of a C compiler on encountering an undefined construct. During a discussion on that group in early 1992, a regular remarked "When the compiler encounters [a given undefined construct] it is legal for it to make demons fly out of your nose" (the implication is that the compiler may choose any arbitrarily bizarre way to interpret the code without violating the ANSI C standard). Someone else followed up with a reference to "nasal demons", which quickly became established. [Jargon File]

Wikipédia

Primitive notion

In mathematics, logic, philosophy, and formal systems, a primitive notion is a concept that is not defined in terms of previously-defined concepts. It is often motivated informally, usually by an appeal to intuition and everyday experience. In an axiomatic theory, relations between primitive notions are restricted by axioms. Some authors refer to the latter as "defining" primitive notions by one or more axioms, but this can be misleading. Formal theories cannot dispense with primitive notions, under pain of infinite regress (per the regress problem).

For example, in contemporary geometry, point, line, and contains are some primitive notions. Instead of attempting to define them, their interplay is ruled (in Hilbert's axiom system) by axioms like "For every two points there exists a line that contains them both".

https://en.wikipedia.org/wiki/Primitive notion